Tags: Analytical Seminar


Characterization of Glycation and Other PTMs in Biotherapeutics Using HILIC-MS

Glycation is an important post-translational modification that is linked to diabetes, cataract, Alzheimer’s, Rheumatoid arthritis and Parkinson’s disease.1 This reaction occurs between a reducing sugar and a primary amine at the N-terminus of protein or the sidechain of Lysine residues.  Ultimately this interaction leads to advanced glycation end products (AGEs) that are associated with several disease complications.2 Glycation could also…


Investigating Analytical Techniques for Microplastic Characterization and Quantification

Exposure to microplastics and nanoplastics throughout daily life is inevitable, yet still poses a variety of unknowns and concerns in biological and environmental systems. Microplastics are defined by the National Oceanic and Atmospheric Association (NOAA) as all plastic particles <5mm in size; either produced to be that size (primary) or via degradation of larger particles (secondary). Ubiquitous in nature, microplastics have successfully…


Measuring Photolytic Mass Loss of Humic Substances with a Quartz Microbalance(QCM)

Secondary organic aerosol (SOA) is formed in the atmosphere through the oxidation of volatile organic compounds (VOCs) and represents a significant portion of global submicron-sized atmospheric organic aerosol. SOA plays a crucial role in multiple processes that impact climate and human health. Photodegradation of SOA under solar radiation is an important sink for atmospheric SOA and influences its evolution.[1] Therefore, a better understanding…


Monitoring of Spent Nuclear Fuel Treatment Steps by Analytical Methods to Improve Efficiency

Nuclear power has broad application prospects as a kind of clean energy. One of the biggest controversies in the development of nuclear energy has been the potential environmental impact of spent fuel (SNF), which is the raw material of incomplete reactions and toxic byproducts.  At present, people still use landfills to deal with SNF residues, whether for low-level radioactive wastes or high-radioactive wastes after separation…


Characterizing Surface Active Organics in Sea Spray Aerosol and Their Influence on Cloud Microphysics

Oceans produce one of the largest global natural sources of aerosol in the form of sea spray aerosol (SSA) particles which therefore play a large role in global climate dynamics. SSA particles are enriched in ocean-derived organic compounds, specifically surfactants, which influence the chemical properties of SSA and the potential for SSA particles to become cloud seeds. Hygroscopic growth studies performed on 100 nm laboratory-generated sea…


Sampling, Ambient Mass Spectrometry, and the Philosophy of Damage in a Museum Setting

With some 150 million objects (including living specimens) in its collection that have been selected for conservation and are available for study, the interests of the Smithsonian Institution fill every niche. Though material analysis is needed to support all manner of research, it may be more important to the museum and other interested parties that rare, precious, or culturally sensitive objects remain un-damaged. Mass spectrometry in its…


Forensic Analysis for Ricin in the 2011 Case of the Georgia Militia


Obtaining Ambient Organic Aerosol Volatility Using the Filter Inlet for Gas and Aerosol Phase (FIGAERO)

Aerosols are a suspension of solid or liquid particles in a gas. They can influence the climate directly through scattering or absorption of solar radiation, or indirectly through their ability to act as cloud condensation nuclei. Tropospheric aerosols are comprised from an organic as well as inorganic phase with the organic phase being a major constituent. Organic aerosol composition is affected by both chemical and physical atmospheric…


Ambient Ionization Mass Spectrometry Application in Therapeutic Drug Monitoring

Therapeutic drug monitoring (TDM) is a quantitative test that measures drug dosage to prevent underdose or overdose in clinical practice [1]. Ultrahigh sensitivity and selectivity techniques such as mass spectrometry has superior advantages over traditional immunoassay technique in the diagnosis and quantification of therapeutic drug [2]. While liquid chromatography coupled with mass spectrometry has shown to be a "golden standard" for TDM [1,2…


Identification of Glycosaminoglycans with MS-Based Analytical Techniques

Glycosaminoglycans (GAGs) are linear anionic polysaccharides that play many important biological functions such as cell-signaling, cell recognition, inflammation, angiogenesis on the cell surface1. However, the structural heterogeneity of GAGs and their low abundance in biological systems have made their analysis difficult2. There has been much interest over the decades to characterize the structures of GAGs to better understand their function…
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